Tree 구조 만들기 root node1 node2 node3 node31 node32 node33 .tree, .tree ul{ list-style:none; padding-left:20px;} .tree *:before{ width:20px; display:inline-block;} .tree label{ cursor:pointer;}.tree label:before{ content:'+'}.tree a:before{ content:'=>'} .tree a{color:#393939; text-decoration : none;}.tree input[type="checkbox"] { display: none;} .tree input[type="checkbox"]:checked ~ul { display: ..